Piper Arrow IV, Maintenance Manual

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7. Retract the gear electrically and ascertain that the red gear unsafe light will go out when the gear has
retracted and the pump has shut off.
ADJUSTMENT OF NOSE GEAR DOWN LIMIT SWITCH.
The gear down limit switch is mounted on the horizontal support tube of the engine mount that runs
between the right attachment points of the gear housing and upper drag link.
1. Ascertain that the gear is down and locked.
2. The down limit switch should actuate only after the leading edge of the downlock hook, when moving
to the locked position, has passed the downlock roller by .06 of an inch. (Refer to Figure 32-22.) Position the
hook at this location in relation to the roller by moving the actuator piston manually toward the up position.
The downlock spring may be disconnected, if desired.
3. Loosen the attachment screws of the actuator located on the downlock hook and move it toward the
switch until it is heard to actuate. Retighten the actuator screws.
4. Manually move the hook from the locked to the unlocked position and ascertain that the switch
actuates at the correct location of the hook.
5. Retract and extend the gear electrically by turning the master switch on, raising the emergency gear
extension lever and moving the gear selector handle to the up position. As the gear begins to retract the green
light below the selector should go out and the red gear unsafe light at the top of the instrument panel should
come on.
ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH.
A gear up limit switch is located in each wheel well above the gear door hinge. There is no adjustment of
these switches other than check that the gear, when retracting, will actuate the switch within .88 of an inch of
full up. Switch operation turns the red gear unsafe light out.
ADJUSTMENT OF MAIN GEAR DOWN LIMIT SWITCH.
A gear down limit switch is mounted on a bracket which is attached to the lower drag link of each main
gear. The switch should be adjusted to allow it to actuate thus turning on the green indicator light within the
cockpit when the downlock hook has entered the locked position and is within .025 to .035 of an inch of
contacting the downlock pin. (Refer to Figure 32-23.) Adjustment of the switch may be as follows:
1. Ascertain that the main gear downlock is properly adjusted as described in Adjustment of Main
Landing Gear.
2. Raise the airplane on jacks. (Refer to Jacking, Chapter 7.)
3. Ascertain that the landing gear is down and pressure is relieved from the hydraulic system. To relieve
pressure, hold down the emergency extender lever.
4. Raise the downlock hook assembly and place a .030 of an inch feeler gauge between the horizontal
surface of the hook that is next to the switch (the surface that contacts the downlock pin) and the rounded
surface of the pin. Lower the hook and allow it to rest on the feeler gauge.
5. Loosen the attaching screws of the switch and, while pushing up on the center of the link assembly,
rotate the switch toward the hook until it is heard to actuate. Retighten the attaching screws of the switch.
6. Manually move the hook assembly up from the pin until the hook nearly disengages from the pin.
Then, with pressure against the bottom of the link assembly, move back to ascertain that the switch actuates
within .025 to .035 of an inch of full lock.
32-60-05
Page 32-57
December 1, 1978
2F16
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL